Re: LZ: Timer interrupt when LCD is off?

To: list-zshell@lists.ticalc.org
Subject: Re: LZ: Timer interrupt when LCD is off?
From: Rigor Mortis <ksmith@capitol-college.edu>
Date: Mon, 07 Jul 1997 01:58:41 -0400
References: <19970706173532493.AAE142@nt-1>
Reply-To: list-zshell@lists.ticalc.org

>From all that talk about how the calc is reset if you take out a battery
and press the on key, it would seem that after the calc is turned off,
the processor doesn't do anything until ON is pressed, which would mean
no interrupts are occuring.  I don't remember how it checks for the ON
key when it's off though; if it uses an interrupt to check for the ON
key (when it's off), then it might be possible.

If you just turned the LCD off and didn't turn off the rest of the calc
(maybe just set the contrast to 0), the processor would still be
running, and you could have interrupts going, and have a loop checking
for the ON key interrupt.

Hey, I'd love to be proven wrong.  Having a clock that keeps the current
time even when the calc is turned off would be nice (like on the HP48).
-mortis

Ess Andreas wrote:
> 
> Is that possible? Would be useful for several things, like real-time clocks, etc.
> 
>  Andreas
> ----------------
> E-Mail:  ess.andreas@computerhaus.at
> Webpage: http://andi.ganymed.org

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References:

LZ: Timer interrupt when LCD is off?

From: ess.andreas@computerhaus.at (Ess Andreas)